Unit pulverizer



- Aug. 13, 1929. BE K 1,724,876

UNIT PULVERI ZER Filed Sept. 22, 1927 4 Sheets-Sheet 1 gmentoz WW Q. M

' atbozueq Aug. 13, 1929. HQLBECK 1,724,876

UNIT PULVERIZER Fil pt 22. 1927 4 Sheetsheet 2 Aug. 13, 1929. AA. HOLBECK UNI T PULVERI ZER Filed Sept. 22, 1927 4 Sheets-Sheet 3 {III/IIIIIIIIIIIIIIII gwventoz Maw 851;, M

Aug. 13, 1929. A. A. HOLBECK 1,724,875

UNI T PULVERI Z ER Filed Sept. 22, 1927 4 sheets-sheet 4 Patented Aug. 13, 1929. I

UNITED STATES PATENT OFFICE.

AUSTIN A. HOLBECK, OF CLEVELAND, OHIO.

UNIT. PULVERIZER.

Application filed September 22, 1927. Serial No. 221,181.

This invention relates to pulverizing mainvention consists in the construction and chines, and more particularly to a unit pulcombination of elements hereinafter deverizer which 1s inexpensive to manufacture, scribed and claimed.

efficient in Operation, due to its simplicity Referring to the drawings, 55 of construction, and novel arrangements of Figure 1 is a front elevational view of the working elements. unit pulverizer embodying my present in One of the objects of the present invention vention. is to provide in a pulverizer of the type re- Figure 2 is a top plan view. ferred to, pulverizing members having rcla- Figure 3 is a vertical sectional View on line 60 tive rotation in such a manner that the ma- 3--3 of Fig. 2, the motor being illustrated terial being fed thereto is thoroughly pulin id l vatio VePiZed in p g between e p e g Figure 4 is a transverse cross sectional members. view on line 4-4 of Figure 2.' Another ob ect of the invention is to pro- Fi 5 i an d i ith th hi d 65 vide a novel means for feeding the material su p rt f r o f th m i d i tors into the pulverizing members in such a manbeing swung to open position. ner that pulverization takes place as the Figure 6 is an end view with the hinged material travels outwardly between the support swung inwardly and withthe motor members, and is, as a result, thoroughly pulremoved. 1 vellled- I In the drawings I have illustrated the pre- Another ob ect of the invention is to proferred construction of a pulverizer embodyvide a novel means for discharging the puling my present invention, in which 10 repreverized material, which includes preferably sents generally the pulverizer housingof cast a fan member carried by one of the puliron or other suitable material. This hous- 25 verizing members, which, by its rotation, ing 10 comprises a cylindrical portion 11, of forces the pulverized material through a disa' shape similar to that of a fan housing, and charge opening as the pulverized material has a neck portion 12 at the upper part leaves the pulverizing members. thereof, serving as an outlet for the pulver- A further object of the invention resides ized material. The cylindrical portion 11 is 30 in the provision of separate motors for the formed integral at its lower end with a pulverizing members, one of said motors belaterall extending base 13, as shownin Fig. ing pivotally supported in a novel manner to 1, by w ich the pulverizer is supported upon afford access to the interior of the pulverizer a floor or othersuitable structure. so the latter can 'be readily inspected and. The cylindrical portion 11 has uponlone repair side thereof a central opening 14 around Another object of the invention is to prowhich extends an integral lateral enclosure vide a magnetic element for attracting the 15 provided with an inlet opening 16, metallic particles present in the material through which coarse material separatedwhich is fed into the pulverizer, and means from the pulverized material discharged 40 for removing the said collected particles from the neck 12 is returned to the pulverwithout interruption in -the operation of the izer for further treatment. pulverizer. The opposite side of the cylindrical por- It is a further object of the invention to tion 11 has an opening 17 which is normally provide means adjacent the discharge openmaintained closed b a cover 18 bolted as at 45 ing, for separating the coarser material 19 to the cylindrica portion 11 adjacent the from the pulverized material and to return opening 17 ,or by any other suitable means. the coarser material to the action of the pul- The cover 18 has a central opening 20, verizing members, to thereby further pulveraround which extends an integral lateral enize the material. closure 21, the latter being provided with 50 With the objects above indicated and other transverse slots 22 for admitting air towithobjects hereinafter explained in View, my in the pulverizer, the quantity of an admitted being controlled by a rotatable plate 23, having openings 24 cooperating with the openings 22 of the enclosure 21. The movement of the plate 23 is limited by a bolt 25 disposed in a circumferentially extending slot 25 transversely of the plate 23, and so positioned that the openings 22 and 24 can be moved into alignmentto admit a large quantity of air by rotating the plate 23 in one direction or moved completely out of alignment to thereby admit no air, by rotation of the plate 23 in the opposite direction.

Communicating with the interior of the enclosure 15, as clearly shown in Fig. 4, and formed integrally therewith is a chute 26 having a hopper 27 at its upper end through which the raw material is fed to the pulverizer 10. A rotary pocket feeder 28 is positioned in the upper portion of the chute 26 and is secured upon a transverse shaft 29 which has its outer ends rotatably journaled in the side walls of the chute 26 and which feeder is rotated in a manner later described. The feeder 28"has longitudinally extending pockets 30 disposed upon opposite sides thereof for receiving the raw material from the hopper 27 and delivering predetermined quantities of the material to the chute 26. To insure against the possibility of breaking any of the operating elements, the hopper 27 has a portion 31 of its rear wall ivotally connected at 32 to the sides of the upper end of the chute 26 and the portion 31 has a depending extension .33, Whose front face is concave and cooperates with the periphery of the rotary pocket feeder 28. This extension 33 is maintained in normal engagement with the feeder 28 by a spring 34 abutting at one end with the extension 33 and at the opposite end against a stop on a bolt 35 in threaded engagement with therear wall of the chute 26. It will be readily understood, therefore, that should exceptionally large pieces of raw material be fed to the pockets 30 of the rotary pocket feeder 28 and thereby carried around toward the chute 26, the pivoted portion 31 would be forced outwardly against the .tension of the spring 34 and the material deposited in the chute 26 without in any manner injuring the feeder 28.

The material fed into the chute 26 usually contains metallic particles, and inasmuch as this is undesirable in the pulverized fuel as well as in the pulverizer, I provide a permanent magnet 36 secured within a transverse flanged opening 37 in the bottom of the chute 26 which attracts the metallic particles thereto. The face of the magnet 36 is kept clean and free of the accumulated parti-,

cles by a brush or wiper 38, which is continuously moved across the magnetby a double acting worm or thread upon a transv verse shaft 39, having a reciprocating collar 40 in engagement therewith and screwed to the brush 38. The ends of the shaft 40 are rotatably supported in brackets 41, attached to the outer sides of the chute 26 and the shaft is rotated by any suitable means, but preferably in a manner to be later described.

The interior of the chute 26 can be inspected and repaired through an opening 42 in the top thereof, ,which is normally closed by a cover 43 bolted or otherwise secured over the opening.

The material which is fed by the chute 26, as before explained, enters the enclosure 15 at an angle as shown in Fig. 4. A pair of scoops 44 and 45, respectively, are disposed within the extensions 15 and 21, and are rotatable in opposite directions preferably. These scoops 44 and 45 have pluralities of vanes 0r inclined members 46, which are adapted on the scoop 44 to pick up the material and feed the same inwardly, while the vanes 46 on the scoop 45 assist in the distribution of the air around the pulverizer. The scoops 44 and 45 have secured to their inner faces, or formed integrally therewith, cylindrical members 47 and 48, respectively, the member 48 being of smaller diameter than the, member 47. The member 48 is provided with, in this instance, three laterally extending concentric drums 49', 50 and 51, prefer ably formed integral therewith and having their inner edges freely suspended. The member 47 is provided with, inthis instance, two laterally extending integrally formed concentric drums '52 and 53, having their inner edges freely suspended, and so positioned that when in assembled relation with the drums 49, 50 and 5 1, the latter will interleave or overlap with the former. Each of the drums are provided with a plurality'of transversely extending apertures 54, spaced suitably apart throughout their circumferences, and any desirable number of apertures being provided. The outer end of the cylindrical member 47, and beyond the drum 51, has a plurality of transversely extending blades 55 formed integrally therewith, and the opposite ends are joined by a ring 56. These blades 55 serve as a fan for blowing the pulverized material out through the outlet 12. o

The scoop 44 is loosely mounted on a re tatable transverse shaft 57 and actuated by a motor 58 supported upon the base 13 suitably connected in an electrical circuit. The

inner end of the shaft 57 terminates short of the center of the drums, and has a hub 58 'keyed, or otherwise secured thereto, and

. the drum 52 rotating in the opposite direction to the drum 47 which will cause the material to be finely ground and pulverized. When the pulverized -material is finally forced out through the apertures 54 in'the outermost drum 51, the blades 55 will cause the material to be blown out-through the outlet 12 to any desirable location. I

It is desirable to be able to have access to the interior of the pulverizer, and this may be had through the cover 18, but for convenience I have provided the cover with a pair of ears or extensions 65, which are pivotally connected to a pair of horizontally extending arms 66 of a bracket 67, the latter being provided with ,a pair of arms 68 extending in the opposite direction and pivotally connected .by a vertically extending rod 69 to a pair of arms 70 of a bracket 71. This latter bracket 71 has a second pair of arms 72 which are pivotally connected to'a pair of extensions or' ears 73 formed integrally with the fan shaped housing 11. With this pivoted arrangement it is, therefore, possible to first move the cover 18, together with the drums 49, 50 and 51 and motor 61, in a horizontal plane until the drums 49, 50 and 51 have been moved out of cooperative engagement with the drums 52 and 53, and to then swing the supporting platform 62 about its vertical pivotal axis, thereby exposing the interior of the pulverizer.

It will also be noted that this cover plate 18 supports the drums 49, 50 and 51 and the scoop 46 which are driven by the motor 61, so that in removing the cover 18 from the housing 11 the connections between the motor 61 and the drums are not interrupted.

The rotary pocket feeder 28 can be rotated at any desirable speed, depending upon the quantity of raw material the pulverizer is required to handle, and in the present instance I have shown suitable reduction gearing enclosed in a housing 74, bolted or otherwise secured to one side of the chute 26. asl clearly shown in Fig. 1. The reduction gearing is suitably connected between the rotary pocket .feeder 28 and a motor 75 supported on a bracket 76 secured to the lower part of the reduction gearing housing 74. The motor 75 may be actuated by any suitable source of power, and the reduction gearing serves to rotate the rotary pocket feeder 28 at .a reduced speed with respect to the motor. The opposite end of the transverse shaft 29 of the rotary pocket feeder 28 is provided with a gear 77 securely fastened thereto, which meshes with a gear 78 secured to the outerend of the transverse shaft 39 for reciprocating the wiper 38. A counter 79 can-be secured to the upper portion of the hopper 27 and connected by suitable links 80 to-the gear 77 for the purpose of ascertaining the number of revolutions of the rotary pocket feeder 28 or the number of charges of material to the chute 26.

The operation of the pulverizer. is as follows:

The raw material is deposited in the hopper 27, and passes in predetermined quantities into thechute 26, and thence into portions of the housing, where it is picked up by a rotary scoop 44 and fed inwardly to the interior of the innermost drum 49. These cooperating drums are rotated by the motors 57 and 61, in opposed directions, or at least at different relative speeds, the material within the drums being thrown outwardly by centrifugal action. The drums being provided with transverse openings 54 permits portions of the material to pass therethrough and the material coming in contact with the adjacent drum travelling at a different rate of speed results in finely grinding or pulverizing the material. The material becomes more finely pulverized as it passes through the openings from the innermost drum to the outer drum, and as the material leaves through the openings 54 in the outer drum 51 it is blown out through the discharge outlet 12 in the fan-shaped housing 11 by the action of the blades. 55.

.-If for any reason coarser material should be injected into the pulverizer than the latter can handle and cause the drums to lock,

spirit of the invention as defined in the appended claims.

Furthermore, it is to be understood that I am not to be limited to a pair of pulverizing drums rotatable in opposite directions to efi'ect complete pulverization, inasmuch as the same result may be obtained by having the pulverizing drums rotatable in the same direction but at relatively different speeds, or one of the pulverizing drums may be stationarily mounted, while the other of said drums is adapted to rotateto effect pulverization of the material.

I claim is: u

1. In a pulverizer of the type described, a housing, a removable cover plate attached thereto, a pair of cooperating pulverizing members, one of which is removable with said cover plate, means for delivering material to said members, andmeans for causing relative rotation therebetween.

2. In== a pulverizer of the type described, a housing having a stationary motor base and'a movable motor base, motors supported on said bases, and a pair of cooperating pulverizin members associated with said motors and disposed Within said housing.

3. In a pulverizer of the type described, a housing having an opening in one side thereof, a movable base supported by said housing, a cover plate for said opening carried by said base, a motor on said base, and a pair of cooperating pulverizing members disposed Within said housing, one of said members being connected to said motor.

4. In a pulverizer of the type described, a fan housing, a removable cover therefor, a pair of cooperating pulverizing members disposed in said housing, one of said members being removable with said cover,,.transverse openings in said members, blast means carried by one of said members, and means for gausing relative rotation between said memers.

5. In a pulverizer of the type described, a pair of relatively rotatable members, flanges carried by said members, the flanges of one member being disposed between the flanges of the other member, transverse openings in said flanges, blast means carried by one of said members and positioned over said openings, and means for feeding material to the inner flange.

6. In a pulverizer of the type described, a housing provided with a material inlet and an outlet, apair of slotted pulverizing members having overlapping portions, on one of said members adapted to feed material from said inlet to the inner member, grid means for relatively rotating said memers.

7. In a pulverizer of the type described, a housing provided with a material inlet and an outlet, an opening in said housing, a movable cover for said opening, a pair of slotted pulverizing members having overlapped portions, a scoop on one of said members adapted to feed material from said inlet to the inner member, and motors for rotating said members, one of said motors being supported by said movable cover.

8. In a pulverizer of the type described, a housing having an inlet opening and an outlet opening, a base for said housing, an opening III the side of said housing, a movable cover for said opening, a rotatable pulveriz- Having thus described my invention what i a scoop ing member having concentric slotted cylin ers, a plurality of blades carried by said member, a second rotatable pulverizing member having concentric slotted cylinders, the latter cylinders overlapping and being disposed in alternate relation to the slotted cylinders of said first member, scoops rotatable with said members, to deliver material to the innermost cylinder, a motor for rotating one of said members and supported by said base, and a motor for rotating the other of said members, and supported from said pivoted cover.

9. In a pulverizer of the type described, a hopper, a chute, means for transferring predetermined quantities of material from said hopper to said chute, a housing, a pair of pulverizing members in said housing, said members having concentric slotted cylinders disposed in overlapping alternative relation, means for feeding material to the innermost cylinder, and means for rotating at least one of said members.

10. In a pulverizer of the type described, a hopper, a chute, means for delivering pre determined quantities of material to said chute, a housing communicating with said chute, apair of slotted pulverizing members in said housing, said members having portions overlapping and disposed in alternate relation, scoops secured to said members,'one of which is adapted to deliver material to the interior of said overlapping portions, transverse shafts upon which said members are mounted, means including break pins for connecting said members to said shafts, and means for actuating said shafts to cause said members to be rotated relatively. Y

11. In a pulverizer of the'type described, a housing, pulverizing members supported within said housing, and a motor movably supported with respect to said housing and adapted to cause rotation of some of said members, said last mentioned members being removable when said motor is moved.

12. In a pulverizer of the type described. a housing, pulverizing members supported within said housing, and a motor movably supported with respect to said housing and adapted to cause rotation of some of said members, said last mentioned members being movable through said housing when said motor is moved.

13. In a pulverizer of the type described, a housing, pulverizing members supported within said housing, a support movably carried by said'housing, and amotor mounted on said support and adapted to cause rotation of some of said members, said last mentioned members being movable with said support.

In testimony whereof, I hereunto aifix my signature.

AUSTIN A. HOLBECK.

one of which is adapted 

